Prior to joining LACI, he was appointed by Mayor Eric Garcetti as the first ever Chief Sustainability Officer for the City of Los Angeles. Serving as CSO for four years, Petersen was the chief architect of the groundbreaking Sustainable City pLAn, helped LA become a global leader in EVs, solar and water conservation, and helped create the Climate Mayors. Petersen co-founded Global Green USA and led the organization for 19 years as President and CEO.

Petersen is chair of the Climate Mayors board, and a board member of Habitat for Humanity of Greater Los Angeles, Center for Environmental Health, and the Sir Edmund Hilary Institute for International Leadership. Petersen also created Citizen E to find and support individuals taking responsibility for a corner of their world. Petersen is a member of the Council on Foreign Relations, the Pacific Council on International Policy, the LA Sustainability Leadership Council. He and his son live in Santa Monica, and Matt is a retired AYSO coach.

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VERDEXCHANGE commits to: 1) connecting the green dots to spur growth of the green economy and the use of clean energy while reducing greenhouse gas pollution; 2) offering commercial entrepreneurs, global investors, environmental stewards, and public officials information and a marketplace for continually learning of innovations, opportunities, and public policies that are driving the trillion dollar global energy and climate change marketplace; and 3) spurring growth of the green economy.